35 
various mineral substances ; the bright red cinna- saloon. 
bar (native Vermillion, much esteemed by pain- Nat. Hist. 
ters) ; the hepatic mercurial ore, from Idria, com- 
pact and slaty : the former also with petrifac- 
tions (coral-ore), Corneous mercury (muriate of 
mercury) with native quicksilver, &c. 
(Case 26. This case contains (besides some 
additional specimens of gold and mercurial ores, 
among the latter of which is the scarce native 
amalgam, crystallized and globular) the ores of 
silver, between which and the ores of gold is 
placed the alloy, called electrum, from Smeof in 
Siberia, and the auriferous silver from Kongs- 
berg in Norway, both being a mixture of gold 
and silver in different proportions ; another alloy 
of silver is the scarce antimonial silver from 
Wolfach in the Black Forest. — Among the nu- 
merous varieties of native silver may be particu- 
larized the various imitative forms in which it 
occurs, such as tooth-shaped, wire-shaped, den- 
dritical, moss like, recticular, &c, many of which 
are aggregations of minute crystals. — Vitreous 
silver or common sulphuret of silver ; massive, 
crystallized and in other external forms, among 
which are the laminar and capillary. — Brittle vi- 
treous silver, of which some specimens are also 
deposited in the following glass case. 
(Case 27.) The ores of silver contained in this 
L 2 case 
